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A wire is bent to form a semicircle of the radius a. The wire rotates about its one end with angular velocity `omega` . Axis of rotation is perpendicular to the plane of the semicircle . In the space , a uniform magnetic field of induction B exists along the aixs of rotation as shown in the figure . Then -

A

Potential difference between P and Q is equal to `2Bomegaa^2`

B

Potential difference between P and Q is equal to `2pi^2Bomegaa^2`

C

P is at higher potential than Q

D

none of these

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A
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